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If successful, it would split miner resources and cause the next block to be mined at half speed.
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No, it wouldn't cause the next block to be mined at half speed.
I think he means if a 1 block fork was in fact generated
and split the network 50/50... Then in that case, I think
it would cause the next block to be mined at half speed.
No.
Both forks would be mining and the total hash rate would remain the same for the sum of the two forks. So the next block would be mined at the same speed.
It would just be that each fork only had a 50% chance of finding the next block, so if you were looking at just one fork with half the hash rate, it might take an average of double the time for that side of the fork to find the next block. The other side would also have the same chance. He is neglecting that there are two forks.